#define  _CRT_SECURE_NO_WARNINGS
#include<iostream>
#include<vector>
#include<string.h>
#include<algorithm>
#include<functional>
using namespace std;

void test01()
{
	negate<int>i;
	cout << i(20) << endl;
	plus<int>j;
	cout << j(10, 20) << endl;
}

int main()
{
	test01();
	return 0;
}